regarding the concerns raised by sarang on atomic swap fingerprinting, as far as we understand, only the exchaging parties can understand the link between the fingerprinted bitcoin output and the monero output. in practice, only those who have seen the encrypted signature (=adaptor signature) can gain information about the monero address. but the encrypted signature will be communicated in a private side channel by

the participants. only the decrypted signature becomes public on the bitcoin blockchain, and from it, no monero address can be derived, nor the knowledge that there ever was a secret key hidden in that signature.